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甜菊糖苷是一种天然甜味刑,在酸性条件下水解为异甜菊醇。异甜菊醇具有降血压、降血糖、抗炎和抗肿瘤等生理活性。本文对异甜菊醇及其衍生物在抗炎、抗肿瘤、手性催化和分子识别方面的应用研究进行了总结。 相似文献
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紫苏醇为天然存在的单萜类物质,性质稳定,耐热耐酸,不易挥发,存在于柑桔、樱桃、薄荷、香柠檬、姜草、杂薰衣草等多种植物中,用途十分广泛,在医药、日化及食品等行业均有应用,有较大的研究价值和应用前景。文章综述了紫苏醇的性质及获得方法、作用及应用、衍生物合成及常用剂型发展,为紫苏醇及类似物的进一步研究提供参考。 相似文献
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川芎化学成分及药理作用研究新进展 总被引:1,自引:0,他引:1
川芎作为祖国传统中药材,素因其有效的化学成分及广泛的药理作用而闻名于世。川芎所含有的多种化学成分分别在抗炎、镇痛、抗血栓形成、促血管舒张、抗哮喘、抗呼吸抑制、抗纤维化、抗阻塞性疾病及抗肿瘤等方面产生了积极的影响。在这些有效成分中,以苯酞类化合物、川芎嗪以及阿魏酸的作用最为广泛且效力更强,洋川芎内酯以及藁本内酯等亦发挥了积极地作用。目前,研究者们对川芎中有效化学成分在临床应用中的作用机制的研究尚未深入,其所具有的药理作用亦需要更进一步的探究。本文对川芎的化学成分及其药理作用的研究新进展进行综述与总结,以期为今后更进一步探索川芎的药用前景提供科学依据及理论参考。 相似文献
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丝氨醇是一种重要的化学合成中间体,广泛应用于医药、化工等领域。当前丝氨醇的生产主要通过以2-硝基-1,3-丙二醇、二羟基丙酮肟等物质为基础的化学合成方法,但该方法存在高污染、高能耗、难以分离纯化等问题。与传统的化学法相比,通过氨基转移酶等物质介导的生物途径合成丝氨醇,因其绿色环保、低能耗的优势受到人们越来越多的关注。本文对丝氨醇及其衍生物的化学与生物合成方法进行了详细地阐述与分析,并介绍了这类物质在各领域的应用;同时,总结了生物法合成丝氨醇及其衍生物的优势,指出了其未来的发展方向。为进一步研究和开发丝氨醇及其衍生物的制备生产提供了科学性的指导。 相似文献
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橙酮类化合物具有广泛的生物活性,如抗肿瘤、抗氧化、抗微生物、抗肥胖、拒食、除草等活性。由于橙酮类化合物多存在于植物中,且含量不高,所以在对橙酮类化合物进行研究时,需要一些化学方法对其合成。本文综述了橙酮化合物的合成方法,并对合成方法进行分析总结。 相似文献
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药物筛选是新药物研究、制造、合成的必备过程,通过药物筛选,能够从已有的海量化合物中寻找到具有特定药物作用及治疗功能的新化合物,从而提高药物的研发效率,缩短其研发周期,起到降低风险减少成本的作用。随着分子生物学技术的不断发展,该技术的应用对于药理研究及药物临床应用的推进起到了极大的促进作用,提高了药物筛选的特异性,对于药物筛选效率及成功率的提升具有重要的意义。 相似文献
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简要介绍了超分子化学的产生、发展及应用,重点介绍了:①新型超分子化合物的合成及自组装;②新型超分子金属配合物的合成及应用;③新型超分子化合物的合成及药理作用。并对超分子化学的发展进行了展望。 相似文献
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Dongxian Zhuo Aijuan Gu Guozheng Liang Jiang‐tao Hu Li Yuan Lifu Ji 《Polymer International》2011,60(8):1277-1286
High‐performance thermosetting resins should have good toughness and stiffness, so simultaneously toughening and stiffening is the main target in developing high‐performance resins. A novel modified cyanate ester resin with improved toughness and stiffness was developed by copolymerizing 2,2′‐bis(4‐cyanatophenyl)isopropylidene (CE) with hyperbranched polyphenylsilsesquioxane (HBPPSi). The mechanical properties and their nature were systematically investigated from the viewpoint of structure‐property relations using positron annihilation lifetime spectroscopy and spectral analyses. It is found that a suitable content of HBPPSi in CE resin can effectively improve toughness and stiffness. In the case of the CE resin modified with 10 wt% HBPPSi, its impact and flexural strengths are 21 kJ m?2 and 148 MPa, respectively, about 2.6 and 1.4 times of those of neat CE resin. The flexural modulus increases from 3.0 (for neat CE resin) to 3.4 GPa. The results of dynamic mechanical analyses also corroborate the static mechanical properties. The improved toughness and stiffness of CE resin can be attributed to the synergistic effect resulting from changes of both polymer chain structure and aggregation state structure. These attractive features of HBPPSi/CE resins suggest that the method proposed herein may be a new approach for the development of high‐performance resins for cutting‐edge industries. Copyright © 2011 Society of Chemical Industry 相似文献
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Karolina Wojtunik-Kulesza Tomasz Oniszczuk Jarosaw Modoch Iwona Kowalska Jarosaw Szponar Anna Oniszczuk 《International journal of molecular sciences》2022,23(3)
Neurodegenerative disorders such as Alzheimer’s disease (AD) are distinguished by the irreversible degeneration of central nervous system function and structure. AD is characterized by several different neuropathologies—among others, it interferes with neuropsychiatrical controls and cognitive functions. This disease is the number one neurodegenerative disorder; however, its treatment options are few and, unfortunately, ineffective. In the new strategies devised for AD prevention and treatment, the application of plant-based natural products is especially popular due to lesser side effects associated with their taking. Moreover, their neuroprotective activities target different pathological mechanisms. The current review presents the anti-AD properties of several natural plant substances. The paper throws light on products under in vitro and in vivo trials and compiles information on their mechanism of actions. Knowledge of the properties of such plant compounds and their combinations will surely lead to discovering new potent medicines for the treatment of AD with lesser side effects than the currently available pharmacological proceedings. 相似文献